diff options
| author | nemet <nemet@138bc75d-0d04-0410-961f-82ee72b054a4> | 2006-04-03 18:12:15 +0000 |
|---|---|---|
| committer | nemet <nemet@138bc75d-0d04-0410-961f-82ee72b054a4> | 2006-04-03 18:12:15 +0000 |
| commit | 0f6d8eebedb8889622ac22e951cda9a462379be8 (patch) | |
| tree | 021ce578c76b004900ccfc68b913f823be3d27d9 | |
| parent | d76551d98c1ded3ab59400d7dff1dc1d8ebab1f1 (diff) | |
| download | gcc-0f6d8eebedb8889622ac22e951cda9a462379be8.tar.gz | |
* simplify-rtx.c (simplify_unary_operation_1) <TRUNCATE>: When
trying to remove TRUNCATE check if all bits outside the new mode
are identical to the sign bit.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@112643 138bc75d-0d04-0410-961f-82ee72b054a4
| -rw-r--r-- | gcc/ChangeLog | 6 | ||||
| -rw-r--r-- | gcc/simplify-rtx.c | 3 |
2 files changed, 8 insertions, 1 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index b264035e7c7..d15763234be 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,9 @@ +2006-04-03 Adam Nemet <anemet@caviumnetworks.com> + + * simplify-rtx.c (simplify_unary_operation_1) <TRUNCATE>: When + trying to remove TRUNCATE check if all bits outside the new mode + are identical to the sign bit. + 2006-04-03 Jeff Law <law@redhat.com> * tree-ssa-dom.c (propagate_rhs_into_lhs): Avoid useless folding diff --git a/gcc/simplify-rtx.c b/gcc/simplify-rtx.c index cac77ad1fce..0ce033df208 100644 --- a/gcc/simplify-rtx.c +++ b/gcc/simplify-rtx.c @@ -656,7 +656,8 @@ simplify_unary_operation_1 (enum rtx_code code, enum machine_mode mode, rtx op) if ((TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode), GET_MODE_BITSIZE (GET_MODE (op))) ? (num_sign_bit_copies (op, GET_MODE (op)) - >= (unsigned int) (GET_MODE_BITSIZE (mode) + 1)) + > (unsigned int) (GET_MODE_BITSIZE (GET_MODE (op)) + - GET_MODE_BITSIZE (mode))) : truncated_to_mode (mode, op)) && ! (GET_CODE (op) == LSHIFTRT && GET_CODE (XEXP (op, 0)) == MULT)) |